LpDNPH Sorbent Tubes (ORBO)

The single-bed ORBO-DNPH tube contains 120 mg of high purity 2,4-DNPH packed into a 6 mm O.D. x 90 mm Long glass sorbent tube with a break seal "frangible" at both ends. The ORBO-555 and ORBO-558 LpDNPH Tubes both contain two beds packed with high purity LpDNPH with a front bed of 300-mg and a back-up bed of 150-mg. (NIOSH 2016 Appendix B). The ORBO-555 is a 6 mm O.D. tube suitable for sampling at lower flow ranges up to 0.4L/min, and the ORBO-558 is an 8 mm tube which extends the flowrate range up to 2.0L/min.